Legal, Environmental and Other Contingencies	6 Months Ended
Legal, Environmental and Other Contingencies	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Legal, Environmental and Other Contingencies	The Company assesses the probability of an unfavorable outcome of all its material litigation, claims or assessments to determine whether a liability had been incurred and whether it is probable that one or more future events will occur confirming the fact of the loss. In the event that an unfavorable outcome is determined to be probable and the amount of the loss can be reasonably estimated, the Company establishes an accrual for the litigation, claim or assessment. In addition, in the event an unfavorable outcome is determined to be less than probable, but reasonably possible, the Company will disclose an estimate of the possible loss or range of such loss; however, when a reasonable estimate cannot be made, the Company will provide disclosure to that effect. Litigation is inherently uncertain and may result in adverse rulings or decisions. Additionally, the Company may enter into settlements or be subject to judgments that may, individually, or in the aggregate, have a material adverse effect on its results of operations. Accordingly, actual results could differ materially. Litigation Lambeth Magnetic Structures LLC v. Seagate Technology (US) Holdings, Inc., et al. On April 29, 2016, Lambeth Magnetic Structures LLC filed a complaint against Seagate Technology (US) Holdings, Inc. and Seagate Technology LLC in the U.S. District Court for the Western District of Pennsylvania, alleging infringement of U.S. Patent No. 7,128,988, “Magnetic Material Structures, Devices and Methods.” The complaint seeks damages as well as additional relief. The Company believes the claims asserted in the complaint are without merit and intends to vigorously defend this case. The court issued its claim construction ruling on October 18, 2017. The trial is scheduled to begin on April 4, 2022. While the possible range of loss for this matter remains uncertain, the Company estimates the amount of loss to be immaterial to the financial statements. Seagate Technology LLC, et al. v. NHK Spring Co. Ltd. and TDK Corporation, et al. On February 18, 2020, Seagate Technology LLC, Seagate Technology (Thailand) Ltd., Seagate Singapore International Headquarters Pte. Ltd., and Seagate Technology International filed a complaint in the United States District Court for the Northern District of California against defendant suppliers of HDD suspension assemblies. Defendants include NHK Spring Co. Ltd., TDK Corporation, Hutchinson Technology Inc., and several of their subsidiaries and affiliates. The complaint includes federal and state antitrust law claims, as well as a breach of contract claim. The complaint alleges that defendants and their co-conspirators knowingly conspired for more than twelve years not to compete in the supply of suspension assemblies; that defendants misused confidential information that the Company had provided pursuant to nondisclosure agreements, in breach of their contractual obligations; and that the Company paid artificially high prices on its purchases of suspension assemblies. The Company seeks to recover the overcharges it paid for suspension assemblies, as well as additional relief permitted by law. Nidec Corporation v. Seagate Technology LLC, et al. On January 18, 2021, Nidec Corporation (“Nidec”) filed a complaint against Seagate Technology LLC, Seagate Singapore International Headquarters Pte. Ltd., and Seagate Technology (Netherlands) B.V. in the United States District Court for the District of Delaware, alleging infringement of the following patents: U.S. Patent No. 8,737,017, titled “Spindle Motor and Disk Drive Apparatus,” U.S. Patent No. 9,742,239, titled “Spindle Motor and Disk Drive Apparatus,” U.S. Patent No. 9,935,528, titled “Spindle Motor and Disk Drive Apparatus,” U.S. Patent No. 10,407,775, titled “Base Plate, Hard Disk Drive, and Method of Manufacturing Base Plate,” and U.S. Patent No. 10,460,767, titled “Base Member Including Information Mark and Insulating Coating Layer, and Disk Drive Apparatus Including the Same.” (the “Delaware Action”). On March 22, 2021, Seagate initiated JAMS arbitration against Nidec under the arbitration clause of the covenant agreement between Seagate and Nidec. On July 20, 2021, the court stayed the Delaware Action pending the result of arbitration between the parties. On November 9, 2021, following a five-day arbitration hearing, the JAMS arbitration panel decided in favor of Seagate on all issues and directed Nidec to dismiss the Delaware Action. On November 15, 2021, Nidec dismissed its complaint in the Delaware Action with prejudice. Environmental Matters The Company’s operations are subject to U.S. and foreign laws and regulations relating to the protection of the environment, including those governing discharges of pollutants into the air and water, the management and disposal of hazardous substances and wastes and the cleanup of contaminated sites. Some of the Company’s operations require environmental permits and controls to prevent and reduce air and water pollution, and these permits are subject to modification, renewal and revocation by issuing authorities. The Company has established environmental management systems and continually updates its environmental policies and standard operating procedures for its operations worldwide. The Company believes that its operations are in material compliance with applicable environmental laws, regulations and permits. The Company budgets for operating and capital costs on an ongoing basis to comply with environmental laws. If additional or more stringent requirements are imposed on the Company in the future, it could incur additional operating costs and capital expenditures. Some environmental laws, such as the Comprehensive Environmental Response Compensation and Liability Act of 1980 (as amended, the “Superfund” law) and its state equivalents, can impose liability for the cost of cleanup of contaminated sites upon any of the current or former site owners or operators or upon parties who sent waste to these sites, regardless of whether the owner or operator owned the site at the time of the release of hazardous substances or the lawfulness of the original disposal activity. The Company has been identified as a responsible or potentially responsible party at several sites. At each of these sites, the Company has an assigned portion of the financial liability based on the type and amount of hazardous substances disposed of by each party at the site and the number of financially viable parties. The Company has fulfilled its responsibilities at some of these sites and remains involved in only a few at this time. While the Company’s ultimate costs in connection with these sites is difficult to predict with complete accuracy, based on its current estimates of cleanup costs and its expected allocation of these costs, the Company does not expect costs in connection with these sites to be material. The Company may be subject to various state, federal and international laws and regulations governing the environment, including those restricting the presence of certain substances in electronic products. For example, the European Union (“EU”) enacted the Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment (2011/65/EU), which prohibits the use of certain substances, including lead, in certain products, including disk drives and server storage products, put on the market after July 1, 2006. Similar legislation has been or may be enacted in other jurisdictions, including in the U.S., Canada, Mexico, Taiwan, China, Japan and others. The EU REACH Directive (Registration, Evaluation, Authorization, and Restriction of Chemicals, EC 1907/2006) also restricts substances of very high concern in products. If the Company or its suppliers fails to comply with the substance restrictions, recycle requirements or other environmental requirements as they are enacted worldwide, it could have a materially adverse effect on the Company’s business. Other Matters The Company is involved in a number of other judicial, regulatory or administrative proceedings and investigations incidental to its business, and the Company may be involved in such proceedings and investigations arising in the normal course of its business in the future. Although occasional adverse decisions or settlements may occur, the Company believes that the final disposition of such matters will not have a material adverse effect on its financial position or results of operations.